可倾瓦推力滑动轴承弹流润滑研究

发布时间：2018-08-20 12:13

【摘要】：推力滑动轴承广泛应用于电站、钢铁和化工等大型机械设备中,作为其关键部件,推力滑动轴承的性能直接关系到机器整体性能的发挥。随着现代工业的迅速发展,机器的运转速度和载荷日益提高,对滑动轴承提出了越来越高的要求。 1990年,朱均通过对国内多家水电站的大型水轮发电机组中的推力滑动轴承进行了跟踪调查,发现大型水轮发电机组由于推力轴承失效而发生的故障占水利机械总事故的55-70%。因此,迫切需要对推力滑动轴承进行深入研究。本文建立可倾瓦推力滑动轴承弹流润滑的数学模型,编制FORTRAN程序,建立一套分析软件,对可倾瓦推理滑动轴承的润滑性能作数值分析,以此来代替一部分昂贵的试验研究,同时也可以指导轴承设计。本文第一章介绍了推力滑动轴承弹流润滑研究的工程意义,从流体动压润滑、弹流润滑和实验研究等三方面讲述了推力滑动轴承弹流润滑的研究进展,概述了推力滑动轴承的总体结构、支承结构、轴瓦材料以及失效形式,并在此基础上提出了本文的研究内容。第二章在前人的基础上建立了可倾瓦推力滑动轴承弹流润滑的数学模型,主要包含雷诺方程、润滑油粘度温度关系式、密度温度关系式、油膜厚度方程、能量方程和弹性变形方程,以及它们的边界条件。第三章介绍了数学方程的无量纲、离散化、求解方法以及程序求解流程,编制了可倾瓦推力滑动轴承流体动压润滑(THD)性能分析软件,分析了载荷、转速、油品和轴瓦材料等对轴承润滑性能的影响。第四章分析了入口坡形对推力滑动轴承THD润滑性能的影响,计算了三种不同坡形型式和四种不同坡形斜度的入口坡形THD润滑性能。第五章编制了可倾瓦推力滑动轴承弹流润滑(TEHD)性能分析软件,对比了THD和TEHD两种模型的计算结果,分析了载荷、转速、油品对轴承润滑性能的影响。第六章分析了轴线偏斜对可倾瓦推力滑动轴承TEHD润滑性能的影响,计算了五组不同倾斜角下轴承的润滑性能,并将其与对中时的轴承润滑性能作对比分析。第七章总结了本文的工作内容,指出了下一步工作方向。
[Abstract]:Thrust sliding bearings are widely used in large mechanical equipment such as power station, steel and chemical industry. As the key components of thrust sliding bearings, the performance of thrust sliding bearings is directly related to the performance of the whole machine. With the rapid development of modern industry, the running speed and load of the machine are increasing day by day. By tracing and investigating the thrust sliding bearing of large hydroturbine generator set of many hydropower stations in China, Zhu Jun found that the failure of large hydrogenerator unit due to the failure of thrust bearing accounts for 55-70% of the total accidents of water conservancy machinery. Therefore, there is an urgent need for in-depth study of thrust sliding bearings. In this paper, the mathematical model of elastohydrodynamic lubrication of tilting pad thrust sliding bearing is established, FORTRAN program is compiled and a set of analysis software is established to make numerical analysis of lubricating performance of tilting pad inferential sliding bearing, so as to replace some expensive experimental research. At the same time can also guide bearing design. In the first chapter of this paper, the engineering significance of elastohydrodynamic lubrication of thrust sliding bearing is introduced. The research progress of elastohydrodynamic lubrication of thrust sliding bearing is described from three aspects: hydrodynamic lubrication, elastohydrodynamic lubrication and experimental study. The general structure, supporting structure, bearing material and failure form of thrust sliding bearing are summarized, and the research contents of this paper are put forward. In the second chapter, the mathematical model of elastohydrodynamic lubrication of tilting pad thrust sliding bearing is established, which includes Reynolds equation, lubricant viscosity and temperature relation, density temperature relation, oil film thickness equation, etc. Energy equation and elastic deformation equation, and their boundary conditions. In the third chapter, the infinitesimal, discretization, solving method and program flow of mathematical equation are introduced. The (THD) analysis software for hydrodynamic lubrication of tilting pad thrust sliding bearing is developed, and the load and rotational speed are analyzed. The influence of oil and bearing material on the lubricating performance of bearing. In chapter 4, the influence of inlet slope shape on THD lubrication performance of thrust sliding bearing is analyzed, and three different slope types and four different slope THD lubricating properties are calculated. In chapter 5, the (TEHD) software for elastohydrodynamic lubrication of tilting pad thrust sliding bearings is developed. The results of THD and TEHD models are compared, and the effects of load, speed and oil on the lubrication performance of bearings are analyzed. In chapter 6, the influence of axis deflection on TEHD lubrication performance of tilting pad thrust sliding bearing is analyzed. The lubrication performance of five groups of bearings with different inclination angles is calculated and compared with that of middle bearing. The seventh chapter summarizes the work of this paper, pointing out the next work direction.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH133.31

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